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arXiv 2002.06719cs.RO
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基于分析代价和学习初始化的动态四足机器人可靠轨迹

Reliable Trajectories for Dynamic Quadrupeds using Analytical Costs and Learned Initializations

Oxford Robotics Institute, University of Oxford(牛津大学牛津机器人研究所)

Oliwier Melon, Mathieu Geisert, David Surovik, Ioannis Havoutis, Maurice Fallon

摘要:

不平坦地形的动态穿越是腿式机器人领域的主要目标。这些系统的最新模型预测控制方法可以产生短时间的鲁棒动态运动,但是,在较长的时间范围内的规划时,导航复杂的地形可能是必要的。一个最近开发的框架,步行机器人(TOWR)的轨迹优化,计算这样的计划,但不保证他们的可靠性在真实的平台上,在不确定性和扰动。我们扩展TOWR与分析成本生成轨迹,一个国家的最先进的全身跟踪控制器可以成功地执行。为了减少在线计算时间,我们实现了一个基于学习的计划的非线性程序的初始化的基础上离线的经验。一个真正的四足动物在不同地形上执行长达16步和5.5秒的轨迹,证明了该方法在硬件上的有效性。这项工作建立了一个在线系统,可以有效地和强大的重新规划动态轨迹。

英文摘要:

Dynamic traversal of uneven terrain is a major objective in the field of legged robotics. The most recent model predictive control approaches for these systems can generate robust dynamic motion of short duration; however, planning over a longer time horizon may be necessary when navigating complex terrain. A recently-developed framework, Trajectory Optimization for Walking Robots (TOWR), computes such plans but does not guarantee their reliability on real platforms, under uncertainty and perturbations. We extend TOWR with analytical costs to generate trajectories that a state-of-the-art whole-body tracking controller can successfully execute. To reduce online computation time, we implement a learning-based scheme for initialization of the nonlinear program based on offline experience. The execution of trajectories as long as 16 footsteps and 5.5 s over different terrains by a real quadruped demonstrates the effectiveness of the approach on hardware. This work builds toward an online system which can efficiently and robustly replan dynamic trajectories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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